Just to add my $.02: I had a completely opposite experience. I bought the ABC Warrior head from Chris back in the summer. It's the re-tooled version with more accurate pieces. I couldn't be happier on the quality of the cast: no bubbles, nice crisp edges, parts fit well. Shipping was fast, and Chris honored the listed price of when I inquired about the piece, rather than the increased price that's currently listed.
I'll be honest here: I read mixed reviews about what GA had to offer. I knew Chris was the only one with an ABC Warrior head, and it is cast from molds purchased from an RPF member some time ago. I got an opinion on the kit listed on the GA site from another RPF member, and they said if the product looked pretty good.
So, when I contacted Chris I asked straight out about his mixed reputation. I figured I've give him a chance to act decent or act like an ass. He acted decent, I bought the kit, I was pleased. Pretty much end of story, except I need to post pics of the kit for you to see (it's in storage at the moment - next trip over I'll bring it back and take some snaps).
All I can say is, your mileage may vary.